In this online course I will discuss how the process of phase 1 of mushroom composting can be done. The process of phase 1 is different everywhere in the world. Of course there are basics and guide lines you have to deal with. I will explain the prewet phase of the straw and other materials, how to treat the raw materials and what can go wrong. After mixing you have the bunker process the caramelisation process. What to see, smell and look at to get the best compost? Of course I will ask about your process and your experiences. So bring your daily practice combined with the theory behind it! So get more knowledge to prevent mistakes in a early stage, which of course gives you a better productive compost.